Lightning-arrester.



B. RULARKSON.

LIGHTNING ARRBSTBR. APPLICATION FILED FEB.'27, 1909.

948,873. 1 PatentedFepJs,191o.

attenuato l 'To all whomn-'it Kingstrce,

4UNTTED sTATEs i' ""aoWEVNALIP'HA CLARK'SON, OF KINGSTREE SOUTH CPLINA';

LIGHTNING-Annemiek.

may concern:

Be it known that I, Bowes` E, CLAmtsoN, a citizen of the United States, residing at in the -couiity .of "illiainsburg and State of South Carolina, have invented a new and useful Lightning-rrester, ot' which the'following Vis a specification.

It is`tlie object. ot' the present invention toprovide :i lightning arrester which will embody features of construction resulting in the attainment of certain advantageous results not to be secured through the employ- 'nient of the ordinary forni ot' arrester now -in use.

Thc'arrester embodying the present iiivention is of 'that type employing two choke coils which are adapted-gior interposition in a line circuit and a ground conductor so ari to embody'the ground conductor ranged with respect to the choke coilsas to carry otf to ground current of abnormal potential and whereas it has been customary of such arresters in lsleeves which completely inclose -the chokecoils, the present invention contemplates inclosing the coils either in some form of mutilated or open sleeve or partly surrounding the coils by fingers or other similar elements in circuit with the ground. Where the coils are completely inclosed in sleeves, the temperature within the sleeve frequently rises to an abnormal degree during the passage of the current ot' normal potential through the coils,.butl where the coils are inclosed in a mutilated sleeve or only partly surrounded by the ground conductor, of whateverl character it may be, the coils are exposed to the cooling action of the atmospheric air and such heating is obviated.

Another adva itage accruing from the provision o a ground conductor which but partly incloses the coils lies in the fact that a greater number of points of discharge will be provided for than where an -integral sleeve is employed and embodies the ground conductor.

In the accompanying is a perspective view of a lightning arrester embodying the present invention, and Fig. 2 is a transverse sectional view therethrough. In the drawings, the 'numeral 5 indicates the base of [the device which is of any suitable insulating material and upon which are mounted the'choke coils, these coils being indicated, by the numeral 6 and being condrawings, Figure l l nected' each at its ends to the binding posts PATENT oFFieE.

Specification of Letters Patent.

of pairs 'T Patented :11910,A

and 8, the line wires of 'the circuit in which the device isv interposed being connected to the binding posts 7 .and-,the y.wires leading from the coils to the instrument being connected to the bindingjposts-, As shown in the drawings, the two-choke coils G are vpreferably mounted iiiparallela'elation upon the base and the ground conductor which is to be now fully posd between the coils and is ,common to broadly in the idea of inclosingor, "ang ing the choke coils of the. device within lar elements or means which iyvillelpose the ctils to a greater or lessdegree to tliegatiiios- 3 iere, iforiii of ground'conductor is il ust'rated, it is to be understood that the showing of the drawings `illustrates merely Qortie embodiment of the invention and that the vstructure of the ground conductor may be modified in a number of ways. to produce the same result provided of course exposure of the coi'ls totheatmosphere to a greater or less degree.

The forni of ground conductor illustrated in the drawings comprises a plateil' which is formed with a number of slits extending inwardly from each longitudinal or lateral edge toward the mediaii line of the plate to afford a plurality of fingers or tongues at each side of the said plate. As will be observed, the fingers or tongues at each side of tion away from the base and opposite the outer side of the coil, these' lingers being 1ndescribed isi intert and .while 'in' the drawings -allspecilic the structure permits of As heretofore stated, the inventioniresides v dicated by the numeral 10, and others to ex- I tend in a direction away from tlieface of the plate upon which the ground'conductor is secured and thence over the adjacentpr '100 respective coil, `these latter fingers cbeing indicated by the numeral L1,` tremities of the lingers l0 are 'directed'toward the extremities of the fingeis 11 and vice versa. It is preferable that the lingers l0 alteriiatc \yith the lingers 11V and4 vice versa as a more uniform discharge will in this manner be secured throughout the length of each coil. The plate 9 orA body of the ground conductor is insulating base 5 through the medium of lbinding screws 12 and'it is intended that tol either one of these binding screws a wire'is The ends o r exsecured upon the lo be connected and to lead therefrom to ground.

From the foregoing description of the invention it will readily be understood that a current of normal potential will flow from one line wire through the choke coil 6 in circuit therewith, through the wire forming a circuit. between this coil and the instrument, through the instrument, through the other wire connected to the instrument to the other choke coil, through the said other choke coil, and out to line, such current being too weak to bridge the spark gap or interspacc between thc lingers of the ground conductor and the choke coil. However, when a current of abnormal potential is sent through either line wire, it will llow, by way ot this wire, to the choke coil in direct circuit therewith and will discharge to the tingcrs or other elements which partly inclose this coil, and thence to ground through the ground wire connected electrically with t-he ground conductor.

Regarding the advantagesl accruing from the invention, it will be appreciated that the edges ot the lingers partly inelosing the choke coils insure of more ready discharge of current of abnormal potential from the coils to the lingers than is provided for when an integral sleeve is employed to inclose the coils.

What is claimed is In a de vice of the class described, a base, choke coils arranged upon the base side by side but spaced apart and a plate secured upon the base between the coils, the -plate being `slit inwardly from its longitudinal edges toward its middle whereby to afford a plurality of fingers, every other one of the lingers at each side of the plate being bent to extend around and beneath the adjacent choke coil, the remaining fingers at each side ot' the plate being bent around over the adjacent coils.

In testimony as my own, I have hereto affixed my signature in the presence of two Witnesses.

BOWEN ELIPHA CLARKSON.

lVitnesses:

T. B. MCCLAIN, E. L. MCLEAN.

that claim the foregoing 

